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Why did Andrew Jackson describe disunion by armed force as treason?

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Jackson's “Proclamation to the People of South Carolina” — Nullification Crisis U.S. Pres. Andrew Jackson issued his “Proclamation to the People of South Carolina” on December 10, 1832, in response to South Carolina's refusal to be bound by federal tariffs. In it Jackson asserted the supremacy of the federal government and rejected South Carolina's argument that it, as a state, had the right to reject laws made by the federal government that it deemed unconstitutional. Jackson's proclamation was an escalation of the Nullification Crisis, and some argue that it helped lay the foundation for the American Civil War.

President Andrew Jackson described disunion by armed force as treason because he viewed the Ordinance of Nullification as a direct threat to the federal union and national authority.12

In his 1832 proclamation, Jackson argued that the U.S. Constitution did not permit a state to remain in the Union while simultaneously refusing to obey federal laws it deemed unconstitutional. He maintained that allowing a single state to unilaterally decide which laws to follow would effectively grant it the power to resist all federal authority, which he considered incompatible with the existence of the United States. By threatening to use armed force to prevent the collection of federal tariffs, South Carolina was, in Jackson’s view, attempting to dismantle the government from within, an act he categorized as treasonous.321